{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:KIPFAUFZBXQ3F6UYUUA3WMVFUO","short_pith_number":"pith:KIPFAUFZ","canonical_record":{"source":{"id":"2109.03241","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-07T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"141ccb03eb25b46eab0b02b442d28c6834081a9218c8049486ffa692e1d1c130","abstract_canon_sha256":"9cecf8afedd1671c02b63fbcb4bd090ed77d00b2292715c372add868c446c1a7"},"schema_version":"1.0"},"canonical_sha256":"521e5050b90de1b2fa98a501bb32a5a3b9951f2ac9d4cac15e1dd77a801eec59","source":{"kind":"arxiv","id":"2109.03241","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.03241","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"arxiv_version","alias_value":"2109.03241v2","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.03241","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_12","alias_value":"KIPFAUFZBXQ3","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_16","alias_value":"KIPFAUFZBXQ3F6UY","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_8","alias_value":"KIPFAUFZ","created_at":"2026-07-05T03:32:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:KIPFAUFZBXQ3F6UYUUA3WMVFUO","target":"record","payload":{"canonical_record":{"source":{"id":"2109.03241","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-07T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"141ccb03eb25b46eab0b02b442d28c6834081a9218c8049486ffa692e1d1c130","abstract_canon_sha256":"9cecf8afedd1671c02b63fbcb4bd090ed77d00b2292715c372add868c446c1a7"},"schema_version":"1.0"},"canonical_sha256":"521e5050b90de1b2fa98a501bb32a5a3b9951f2ac9d4cac15e1dd77a801eec59","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:32:17.325344Z","signature_b64":"QIh2pQO3txmzHWqZwTgeq9u8QvBam7VRBG9yr+iryQjbUK9rD+ce25hO9BUD/3uWiqkAmCKDrcgwdtHWqhvzBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"521e5050b90de1b2fa98a501bb32a5a3b9951f2ac9d4cac15e1dd77a801eec59","last_reissued_at":"2026-07-05T03:32:17.324865Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:32:17.324865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.03241","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:32:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"33a+AoMIadPZfiepvWHeA5QK06/Rrn4Jot4j4QVoWEy0SnwtEX3FZ3Nngp3+iHVH1rjG6dc6xlc1rXXmPlIwCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T17:11:21.848018Z"},"content_sha256":"9b8b0f7ed9cbf3f3bad2c2ffcb3ca6a4bf7af74021965a843b385fed819a3005","schema_version":"1.0","event_id":"sha256:9b8b0f7ed9cbf3f3bad2c2ffcb3ca6a4bf7af74021965a843b385fed819a3005"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:KIPFAUFZBXQ3F6UYUUA3WMVFUO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The variability of brightest cluster galaxies at high radio frequencies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aeree Chung, Aidan Sedgewick, Alastair Edge, Anthony C. S. Readhead, Jae-Woo Kim, Junhyun Baek, Sebastian Kiehlmann, Tae-Hyun Jung, Tom Rose","submitted_at":"2021-09-07T18:00:00Z","abstract_excerpt":"Variability of a galaxy's core radio source can be a significant consequence of AGN accretion. However, this variability has not been well studied, particularly at high radio frequencies. As such, we report on a campaign monitoring the high radio frequency variability of 20 nearby, cool-core brightest cluster galaxies. From our representative sample, we show that most vary significantly over timescales of approximately one year and longer. Our highest cadence observations are at 15 GHz and are from the Owens Valley Radio Observatory (OVRO). They have a median time interval of 7 days and mostly"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.03241","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.03241/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:32:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X6RyIDXHb8dA902d8waCexSUZjq4lM4Hcxc/WIOSCLwg5zasR5gPGPmO80lantA0EZTJ/Oos+4OleEl/y9GhDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T17:11:21.848982Z"},"content_sha256":"68b0b9049c3d5bdac497eb4343d8dee7947edba0075aa26331810e15410aa92e","schema_version":"1.0","event_id":"sha256:68b0b9049c3d5bdac497eb4343d8dee7947edba0075aa26331810e15410aa92e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/bundle.json","state_url":"https://pith.science/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-21T17:11:21Z","links":{"resolver":"https://pith.science/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO","bundle":"https://pith.science/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/bundle.json","state":"https://pith.science/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KIPFAUFZBXQ3F6UYUUA3WMVFUO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:KIPFAUFZBXQ3F6UYUUA3WMVFUO","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"9cecf8afedd1671c02b63fbcb4bd090ed77d00b2292715c372add868c446c1a7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-07T18:00:00Z","title_canon_sha256":"141ccb03eb25b46eab0b02b442d28c6834081a9218c8049486ffa692e1d1c130"},"schema_version":"1.0","source":{"id":"2109.03241","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.03241","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"arxiv_version","alias_value":"2109.03241v2","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.03241","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_12","alias_value":"KIPFAUFZBXQ3","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_16","alias_value":"KIPFAUFZBXQ3F6UY","created_at":"2026-07-05T03:32:17Z"},{"alias_kind":"pith_short_8","alias_value":"KIPFAUFZ","created_at":"2026-07-05T03:32:17Z"}],"graph_snapshots":[{"event_id":"sha256:68b0b9049c3d5bdac497eb4343d8dee7947edba0075aa26331810e15410aa92e","target":"graph","created_at":"2026-07-05T03:32:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2109.03241/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Variability of a galaxy's core radio source can be a significant consequence of AGN accretion. However, this variability has not been well studied, particularly at high radio frequencies. As such, we report on a campaign monitoring the high radio frequency variability of 20 nearby, cool-core brightest cluster galaxies. From our representative sample, we show that most vary significantly over timescales of approximately one year and longer. Our highest cadence observations are at 15 GHz and are from the Owens Valley Radio Observatory (OVRO). They have a median time interval of 7 days and mostly","authors_text":"Aeree Chung, Aidan Sedgewick, Alastair Edge, Anthony C. S. Readhead, Jae-Woo Kim, Junhyun Baek, Sebastian Kiehlmann, Tae-Hyun Jung, Tom Rose","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-07T18:00:00Z","title":"The variability of brightest cluster galaxies at high radio frequencies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.03241","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9b8b0f7ed9cbf3f3bad2c2ffcb3ca6a4bf7af74021965a843b385fed819a3005","target":"record","created_at":"2026-07-05T03:32:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"9cecf8afedd1671c02b63fbcb4bd090ed77d00b2292715c372add868c446c1a7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-09-07T18:00:00Z","title_canon_sha256":"141ccb03eb25b46eab0b02b442d28c6834081a9218c8049486ffa692e1d1c130"},"schema_version":"1.0","source":{"id":"2109.03241","kind":"arxiv","version":2}},"canonical_sha256":"521e5050b90de1b2fa98a501bb32a5a3b9951f2ac9d4cac15e1dd77a801eec59","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"521e5050b90de1b2fa98a501bb32a5a3b9951f2ac9d4cac15e1dd77a801eec59","first_computed_at":"2026-07-05T03:32:17.324865Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:32:17.324865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QIh2pQO3txmzHWqZwTgeq9u8QvBam7VRBG9yr+iryQjbUK9rD+ce25hO9BUD/3uWiqkAmCKDrcgwdtHWqhvzBw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:32:17.325344Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.03241","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b8b0f7ed9cbf3f3bad2c2ffcb3ca6a4bf7af74021965a843b385fed819a3005","sha256:68b0b9049c3d5bdac497eb4343d8dee7947edba0075aa26331810e15410aa92e"],"state_sha256":"68c8c539d00be175a57a88c041bf975fc884e290ef60ca957bc87fd38d6e0310"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c8FsqsT08ljoNY+tHgZQbCUtuFMV+40+bE38hKwGFAae9dR3e7lR0UspK8pyNWI8RFcnD4aj64r/lJrjgxZhCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T17:11:21.854978Z","bundle_sha256":"93bd3ec747ff16d32fc4c746a614c9b5ae03f158f15c15537de586b291a3f30f"}}